| Calculation and analysis of the harmonic vibrational frequencies in molecules at extreme pressure: Methodology and diborane as a test case. | |
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MedLine Citation:
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PMID: 23083153 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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We present a new quantum chemical method for the calculation of the equilibrium geometry and the harmonic vibrational frequencies of molecular systems in dense medium at high pressures (of the order of GPa). The new computational method, named PCM-XP, is based on the polarizable continuum model (PCM), amply used for the study of the solvent effects at standard condition of pressure, and it is accompanied by a new method of analysis for the interpretation of the mechanisms underpinning the effects of pressure on the molecular geometries and the harmonic vibrational frequencies. The PCM-XP has been applied at the density functional theory level to diborane as a molecular system under high pressure. The computed harmonic vibrational frequencies as a function of the pressure have shown a satisfactory agreement with the corresponding experimental results, and the parallel application of the method of analysis has reveled that the effects of the pressure on the equilibrium geometry can be interpreted in terms of direct effects on the electronic charge distribution of the molecular solutes, and that the effects on the harmonic vibrational frequencies can be described in terms of two physically distinct effects of the pressure (curvature and relaxation) on the potential energy for the motion of the nuclei. |
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Authors:
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R Cammi; C Cappelli; B Mennucci; J Tomasi |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Journal of chemical physics Volume: 137 ISSN: 1089-7690 ISO Abbreviation: J Chem Phys Publication Date: 2012 Oct |
Date Detail:
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Created Date: 2012-10-22 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0375360 Medline TA: J Chem Phys Country: United States |
Other Details:
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Languages: eng Pagination: 154112 Citation Subset: IM |
Affiliation:
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Dipartimento di Chimica, Università di Parma, Viale Parco Area delle Scienze 17/A, I-43100 Parma, Italy. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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